feat: Display github contributors on docs pages

[Firgrep]

A nice feature to have would be if we could display the contributors (by their github profile avatar), similar to how T3-stack does it here with their contributors on docs (scroll down to bottom). I'm sure there are others doing similar things and there are different techniques of achieving this.

T3 docs appear to use a github login to fetch the data, but this won't be possible as we're making a purely static site with no sensitive login info, so another idea could be to make a script using github actions.